fix: ensure metric emission even when slice attr is empty #1396

	name: AWS Lambda Router CI
	on:
	pull_request:
	paths:
	- "aws-lambda-router/*/"
	- "router-tests/*/"
	- ".github/workflows/aws-lambda-router-ci.yaml"

	concurrency:
	group: ${{github.workflow}}-${{github.head_ref}}
	cancel-in-progress: true

	env:
	CI: true

	jobs:
	build_test:
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4

	- uses: actions/cache@v4
	with:
	path: \|
	~/.cache/go-build
	~/go/pkg/mod
	# The go install / version instructions are inside the Makefile, so we need to cache the Makefile.
	key: ${{ runner.os }}-go-${{ hashFiles('aws-lambda-router/go.sum') }}-makefile-${{ hashFiles('Makefile') }}
	restore-keys: \|
	${{ runner.os }}-go-

	- uses: ./.github/actions/go
	with:
	cache-dependency-path: router/go.sum

	- uses: ./.github/actions/go-mod-tidy
	with:
	working-directory: ./aws-lambda-router

	- name: Install tools
	run: make setup-build-tools

	- name: Generate code
	run: make generate-go

	- name: Check if git is not dirty after generating files
	run: git diff --no-ext-diff --exit-code

	- name: Install dependencies
	working-directory: ./aws-lambda-router
	run: go mod download

	- name: Run linters on router
	uses: ./.github/actions/go-linter
	with:
	working-directory: ./aws-lambda-router

	- name: Test
	working-directory: ./aws-lambda-router
	run: make test

	- name: Build
	working-directory: ./aws-lambda-router
	run: make build

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